Which of the Following Is an Example of a Statute

Which of the following is an example of a statute?

A) A representative assembly decides on, and writes out, everything that will be considered a criminal offence.
B) The judges in the highest court decide what will be considered criminal offences.
C) A representative assembly writes out regulations governing the use of smartphones in courtrooms.
D) A judge writes out regulations governing the use of smartphones in courtrooms.